Critical Vulnerability in Linux Kernel: RDMA/mlx5 Hardware Statistics Handling
Summary
CVE-2023-53393: In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device Currently, when mlx5_ib_get_hw_stats() is used for device (port_num = 0), there is a special ha... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware resources and providing essential services to software applications. It supports a wide range of functionalities, including process management, memory management, and device control. The kernel is crucial for system stability and performance. This vulnerability specifically affects the RDMA (Remote Direct Memory Access) subsystem, particularly the mlx5 driver, which is used for high-performance networking. The issue arises from improper handling of hardware statistics when querying device information, leading to potential system crashes.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the RDMA/mlx5 subsystem. The function mlx5_ib_get_hw_stats() does not correctly handle the port number when querying device statistics, particularly when port_num is set to 0. This oversight can lead to a page fault, causing the kernel to crash and potentially resulting in a denial of service. The vulnerability is rooted in the assumption that port_num is always greater than or equal to 1, which is not the case in this scenario. This can lead to critical system instability, affecting all applications relying on the kernel's networking capabilities.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid using the mlx5 driver for RDMA operations until the system is updated with the patched version. Additionally, ensure that any applications relying on this functionality are configured to handle potential failures gracefully.
Conclusion
The vulnerability CVE-2023-53393 in the Linux kernel's RDMA/mlx5 subsystem poses a significant risk due to improper handling of hardware statistics. Users are advised to update their systems to the patched version to ensure stability and security. Temporary workarounds are available, but updating is the best long-term solution.
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FAQ
CVE-2023-53393 is a vulnerability in the Linux kernel's RDMA/mlx5 subsystem that can lead to system crashes due to improper handling of hardware statistics.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
The vulnerability can cause kernel crashes, leading to denial of service and affecting the stability of applications relying on the kernel's networking capabilities.
Yes, a patch is available in the form of the Linux package version 6.1.7-1 or later. It is recommended to update to this version to mitigate the vulnerability.
If immediate updating is not possible, consider disabling the mlx5 driver for RDMA operations as a temporary workaround to prevent potential crashes.
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